Does it say anywhere that the m/f version of PKZIP produces zip files that are compatible with Windoze version of PKZIP? It may be possible but it may require special parameters. Check the documentation.

The problem I have is that people can explain things quickly but I can only comprehend slowly.RegardsNic

Having used the PKZIP product before, I can test you that it's 100% compatible with the PKZIP 2.4g standard. We never had a problem with it on any other platform as long as their installed unzip product met that standard. I don't know what else to day other than contact the vendor and have them take a look, try installing the matching product on your windows machine, try it on another server, or, as a last resort, try creating a gzip-compatible archive and try it on a Unix box.